CN113213869A - Method for preparing autoclaved aerated concrete block by utilizing geopolymer - Google Patents
Method for preparing autoclaved aerated concrete block by utilizing geopolymer Download PDFInfo
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- CN113213869A CN113213869A CN202110398521.7A CN202110398521A CN113213869A CN 113213869 A CN113213869 A CN 113213869A CN 202110398521 A CN202110398521 A CN 202110398521A CN 113213869 A CN113213869 A CN 113213869A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of autoclaved aerated concrete block production processes, in particular to a method for preparing an autoclaved aerated concrete block by utilizing a geopolymer. The cement mixing amount in the autoclaved aerated concrete block can be reduced by utilizing the geopolymer, and the cement quality is reduced to 0.3-0.4% from 5-6% originally; the mould collapse phenomenon in the slurry gas forming process can be effectively reduced, the slurry condensation time is shortened, the standing time is shortened, and the production efficiency is improved; the raw materials for preparing the geopolymer have wide sources and abundant reserves, low-temperature polymerization and solidification reaction can be carried out through the polycondensation of the poly silicate precursor, and the main raw materials of the geopolymer are aluminosilicate minerals such as metakaolin and the like and industrial wastes such as fly ash, blast furnace slag and the like, so that the geopolymer is beneficial to environmental protection.
Description
Technical Field
The invention relates to the technical field of autoclaved aerated concrete block production processes, in particular to a method for preparing an autoclaved aerated concrete block by utilizing a geopolymer.
Background
The autoclaved aerated concrete block is a porous silicate block which is prepared by adding aluminum powder as an air-entraining agent into a mixture of calcareous materials such as cement and lime and siliceous materials such as sand, fly ash and slag, adding water, stirring, casting and molding, carrying out gas expansion, precuring and cutting, and carrying out high-pressure steam curing. The autoclaved aerated concrete block has excellent construction characteristics, can produce various specifications in factories, can be sawed, planed, drilled and nailed like wood, has high construction speed due to the large volume, and can be used as a filling material for various buildings.
The processing of the autoclaved aerated concrete block by using the geopolymer to equivalently replace cementing materials such as cement is a brand new attempt, most of the geopolymer is solid waste residues which are used as main raw materials, so that the solid waste mixing ratio of the autoclaved aerated concrete block can be increased, the stockpiling of solid waste raw materials is reduced, and the ecological management of enterprises is improved.
Disclosure of Invention
The invention aims to provide a method for preparing an autoclaved aerated concrete block by utilizing a geopolymer, which reduces the stockpiling of solid waste raw materials, improves the ecological management of enterprises and improves the production efficiency.
In order to realize the technical effects, the method for preparing the autoclaved aerated concrete block by utilizing the geopolymer comprises the following steps:
s1, firing blast furnace slag through a calcining kiln, grinding until the specific surface area is more than 350 square meters per kg of mineral powder,
s2, adding 6-12% of cement, 3-6% of silicon powder and 6-10% of anhydrous sodium metasilicate alkaline activator into the mineral powder prepared in the step S1, and uniformly stirring to prepare a geopolymer;
s3, adding 3000-3100 parts of castable fly ash slurry into the stirrer;
s4, adding 100-120 parts of the geopolymer prepared in the step S2, 260-280 parts of lime powder and 50-60 parts of desulfurized gypsum into a stirrer;
s5, after the step S4 is finished, stirring and mixing for 3-4 min at the rotating speed of 750-1000 r/min, wherein the pouring temperature reaches 55-58 ℃;
s6, adding 30-40 parts of water into 1.4-1.7 parts of aluminum powder and then adding the aluminum powder and the water into the slurry obtained in the step S5;
s7, pouring after stirring for 30-40 s;
s8, after the slurry is completely filled into a mold, lime begins to react to release heat, aluminum powder liquid begins to generate gas and expand under the conditions of temperature and alkalinity, an anhydrous sodium metasilicate alkaline exciting agent in the geopolymer can provide sufficient alkaline conditions, and after the aluminum powder is generated, the slurry is thickened and solidified under the action of lime hardening to finish static curing;
and S9, demolding, cutting and grouping into a kettle for steam pressure curing when the curing period reaches the cutting condition.
Further, the steam pressure curing process comprises the following steps:
a. vacuumizing to 0.04 MPa;
b. opening a pressure-boosting steam valve to slowly raise the pressure in the kettle to 0.3MPa, boosting the pressure for 1.5h, closing a steam-sending valve to keep for 1h, raising the temperature for 1h for the second time, raising the pressure in the kettle to 1.0-1.25 MPa of the pressure of a pipe network, and carrying out constant-pressure steam curing at the temperature of 175-191 ℃ in the kettle for 5-6 h;
c. and (5) evacuating the kettle for 2-3 h after the constant pressure is finished.
The invention has the beneficial effects that:
1. the cement mixing amount in the autoclaved aerated concrete block can be reduced by utilizing the geopolymer, and the cement quality is reduced to 0.3-0.4% from 5-6% originally;
2. when the geopolymer is utilized, the slurry is aerated for 10-15 min, the coagulation process is accelerated, the aeration rate is properly increased, the die collapse phenomenon in the slurry aeration process can be effectively reduced, the slurry coagulation time is shortened by 5-10 min, the standing time can be shortened by 10-20 min, and the production efficiency is improved;
3. the raw materials for preparing the geopolymer have wide sources and abundant reserves, and can generate low-temperature polymerization and solidification reaction through the polycondensation of the poly silicate precursor, and the main raw materials of the geopolymer are aluminosilicate minerals such as metakaolin and the like and industrial wastes such as fly ash, blast furnace slag and the like, thereby being beneficial to environmental protection;
4. the autoclaved aerated concrete block processed by the method has the following properties: the compressive strength is 2.5-5.5 MPa; the dry density is 450-725 kg/m3(ii) a The drying shrinkage value is less than or equal to 0.5 mm/m; freezing resistance: the mass loss is less than or equal to 5 percent; the thermal conductivity coefficient (dry state) is less than or equal to 0.16W/(m.K); the radionuclide limit IRa is less than or equal to 1.0.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
As shown in figure 1, the method for preparing the autoclaved aerated concrete block by utilizing the geopolymer comprises the following steps:
s1, firing blast furnace slag through a calcining kiln, grinding until the specific surface area is more than 350 square meters per kg of mineral powder,
s2, adding 6-12% of cement, 3-6% of silicon powder and 6-10% of anhydrous sodium metasilicate alkaline activator into the mineral powder prepared in the step S1, and uniformly stirring to prepare a geopolymer; according to the difference of the mechanical properties of the geopolymers prepared by cement, silicon powder and anhydrous sodium metasilicate alkaline exciting agents with different proportions, the higher the mixing amount of the cement, the silicon powder and the anhydrous sodium metasilicate alkaline exciting agent is in a value range, the higher the mechanical property is; higher than the value range, the corresponding manufacturing cost is increased; if the value is lower than the value range, the mechanical property of the geopolymer is correspondingly reduced, and the product quality is not facilitated.
S3, adding 3000-3100 parts of castable fly ash slurry into the stirrer;
s4, adding 100-120 parts of the geopolymer prepared in the step S2, 260-280 parts of lime powder and 50-60 parts of desulfurized gypsum into a stirrer;
s5, after the step S4 is finished, stirring and mixing for 3-4 min at the rotating speed of 750-1000 r/min, wherein the pouring temperature reaches 55-58 ℃; because the pouring stirrer equipment parameters of various manufacturers are inconsistent, the stirring speed, the stirring time and the pouring temperature of the pouring stirrer equipment also have relative deviation;
s6, adding 30-40 parts of water into 1.4-1.7 parts of aluminum powder and then adding the aluminum powder and the water into the slurry obtained in the step S5;
s7, pouring after stirring for 30-40 s;
s8, after the slurry is completely filled into a mold, lime begins to react to release heat, aluminum powder liquid begins to generate gas and expand under the conditions of temperature and alkalinity, an anhydrous sodium metasilicate alkaline exciting agent in the geopolymer can provide sufficient alkaline conditions, and after the aluminum powder is generated, the slurry is thickened and solidified under the action of lime hardening to finish static curing;
and S9, demolding, cutting and grouping into a kettle for steam pressure curing when the curing period reaches the cutting condition.
Further, the steam pressure curing process comprises the following steps:
a. vacuumizing to 0.04 MPa;
b. opening a pressure-boosting steam valve to slowly raise the pressure in the kettle to 0.3MPa, boosting the pressure for 1.5h, closing a steam-sending valve to keep for 1h, raising the temperature for 1h for the second time, raising the pressure in the kettle to 1.0-1.25 MPa of the pressure of a pipe network, and carrying out constant-pressure steam curing at the temperature of 175-191 ℃ in the kettle for 5-6 h;
c. and (5) evacuating the kettle for 2-3 h after the constant pressure is finished.
By using the method, three autoclaved aerated concrete blocks are prepared by three different proportioning schemes, the serial numbers of the autoclaved aerated concrete blocks are respectively marked as 1, 2 and 3, wherein all components of the autoclaved aerated concrete block No. 1 are lower than the numerical values specified in the method; after the preparation is finished, sawing a group of autoclaved aerated concrete blocks discharged from a kettle in an upper, middle and lower forward manner along the central part of the product gas generating direction according to GB11969-2008 'autoclaved aerated concrete experiment method', cutting the autoclaved aerated concrete blocks into a cube standard test piece with the size of 100mm multiplied by 100mm, performing dry density and water content test steps, drying the water in the test piece in an oven, and measuring the volume weight and the strength of the cube standard test piece, wherein the proportioning scheme and the detection result of the three autoclaved aerated concrete blocks are shown in Table 1.
Table 1: proportioning scheme and detection result of three autoclaved aerated concrete blocks
The detection result shows that the grade of the aerated product of the autoclaved aerated concrete block No. 1 is B05, the grade of the aerated product of the autoclaved aerated concrete block No. 2 is B06, and the grade of the aerated product of the autoclaved aerated concrete block No. 3 is B07.
After the steam curing is finished, the quality index of the finished product is detected, and the autoclaved aerated concrete block processed by the method achieves the following performances: the compressive strength is 2.5-5.5 MPa; the dry density is 450-725 kg/m3(ii) a The drying shrinkage value is less than or equal to 0.5 mm/m; freezing resistance: the mass loss is less than or equal to 5 percent; the thermal conductivity coefficient (dry state) is less than or equal to 0.16W/(m.K); the radionuclide limit IRa is less than or equal to 1.0. Completely meets the requirements of GB 11968-2006 _ autoclaved aerated concrete block.
Claims (2)
1. A method for preparing an autoclaved aerated concrete block by utilizing a geopolymer is characterized by comprising the following steps: the method comprises the following steps:
s1, firing blast furnace slag through a calcining kiln, grinding until the specific surface area is more than 350 square meters per kg of mineral powder,
s2, adding 6-12% of cement, 3-6% of silicon powder and 6-10% of anhydrous sodium metasilicate alkaline activator into the mineral powder prepared in the step S1, and uniformly stirring to prepare a geopolymer, wherein the components are weight components;
s3, adding 3000-3100 parts of a casting machine fly ash slurry into the stirrer, wherein the components are weight components;
s4, adding 100-120 parts of the geopolymer prepared in the step S2, 260-280 parts of lime powder and 50-60 parts of desulfurized gypsum into a stirrer, wherein the components are weight components;
s5, after the step S4 is finished, stirring and mixing for 3-4 min at the rotating speed of 750-1000 r/min, wherein the pouring temperature reaches 55-58 ℃;
s6, adding 30-40 parts of water into 1.4-1.7 parts of aluminum powder, and then adding the aluminum powder into the slurry obtained in the step S5, wherein the components are weight components;
s7, pouring after stirring for 30-40 s;
s8, after the slurry is completely filled into a mold, lime begins to react to release heat, aluminum powder liquid begins to generate gas and expand under the conditions of temperature and alkalinity, an anhydrous sodium metasilicate alkaline exciting agent in the geopolymer can provide sufficient alkaline conditions, and after the aluminum powder is generated, the slurry is thickened and solidified under the action of lime hardening to finish static curing;
and S9, demolding, cutting and grouping into a kettle for steam pressure curing when the curing period reaches the cutting condition.
2. The method for preparing the autoclaved aerated concrete block by using the geopolymer as claimed in claim 1, wherein the method comprises the following steps: the steam pressure curing process comprises the following steps:
a. vacuumizing to 0.04 MPa;
b. opening a pressure-boosting steam valve to slowly raise the pressure in the kettle to 0.3MPa, boosting the pressure for 1.5h, closing a steam-sending valve to keep for 1h, raising the temperature for 1h for the second time, raising the pressure in the kettle to 1.0-1.25 MPa of the pressure of a pipe network, and carrying out constant-pressure steam curing at the temperature of 175-191 ℃ in the kettle for 5-6 h;
c. and (5) evacuating the kettle for 2-3 h after the constant pressure is finished.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115368160A (en) * | 2022-09-19 | 2022-11-22 | 陕西地矿第三地质队有限公司 | Aerated brick and production process thereof |
| CN115974471A (en) * | 2022-11-28 | 2023-04-18 | 苏州良浦天路新型建材有限公司 | Preparation method of autoclaved fly ash desulfurized aerated building block |
| CN117776653A (en) * | 2024-02-27 | 2024-03-29 | 上海百奥恒新材料有限公司 | Autoclaved sand aerated concrete composition, building block and preparation method |
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| CN108101487A (en) * | 2017-12-29 | 2018-06-01 | 甘肃润源环境资源科技有限公司 | It is a kind of to utilize concrete segment of high-calcium fly ass production and preparation method thereof |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115368160A (en) * | 2022-09-19 | 2022-11-22 | 陕西地矿第三地质队有限公司 | Aerated brick and production process thereof |
| CN115974471A (en) * | 2022-11-28 | 2023-04-18 | 苏州良浦天路新型建材有限公司 | Preparation method of autoclaved fly ash desulfurized aerated building block |
| CN117776653A (en) * | 2024-02-27 | 2024-03-29 | 上海百奥恒新材料有限公司 | Autoclaved sand aerated concrete composition, building block and preparation method |
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Application publication date: 20210806 |